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RECORD HEAD
MONITOR HEAD
DRU
SPROCKET
space was made available for mounting both a record head and a monitor head. Since film motion tends to be of best quality at the sound drum or immediately following the drum with reference to direction of film travel, the record head was mounted adjacent to the drum on the film take-up side with the monitor head mounted as closely following as facilities would permit. The two head mountings were so designed that by actuation of detent pins the magnetic heads could be rotatably retracted from film contact position to eliminate possibility of abrasive damage to the film emulsion from head contact when using the equipment for photographic recording. This permitted almost immediate change-over from one recording method to the other.
One application of this equipment has been in television studios where double-film systems are used for making kinescope recordings of television programs. Operational economies are realizable due to the versatility of operation of this type of equipment. The purchase and use of such equipment
OIL DASH POT
Fig. 3. Twin-drum recorder with drums in horizontal plane, single film sprocket.
becomes a money saving investment for television studios and others concerned with high-quality sound recording since either photographic or magnetic medium may be used for the original recording with magnetic recording available for making protection "takes" when two of these units are available.
Sound quality attainable with such equipment is at least as good with magnetic film as with photographic film. Reproduction using the record head is superior to that using the monitor head principally because of the better film motion obtainable at the recordhead location. For this reason, the equipment is provided with switching facilities to permit the record head to function as a "playback" or reproducing head when best quality reproduction is desired.
Representative of the different approach used in designing a film-drive mechanism specifically for magnetic recording and reproducing is the mechanism shown schematically in Fig. 3. Since freedom of design permitted, an addition was made to the basic film
C. £. Hittle: Film-Drive Filter
325